Colour of the 
Continuous 
Spectrum at 
the Place. 
CITRON. 
GREEN. 
THE SOLAR SPECTRUM AT THE DATE 1877-78. 
Object Observed, generally a black, fixed 
Fraunhofer Line. 
Fine line, 
Do. B 
Strong line, 
Faintest band, . 
Strong double : 1st component, 
, 2nd do. 
Fine line, . S 
Do. i 4 é - 
Very strong double— 
Ist component, 
2nd do. 
Citron colour ends here. 
Green colour begins here. 
Strong line, 
Very fine line, . 
Fine line, : : 
Very strong line 
Fine line, 
Strong line, 
Do. 
Fine line, 
Clear line, 
A single, solitary line, 
Fine line, - ; 
Do. 
Do. 
Fine line, . 
Very strong line, 
Close double line : 
. 
Ist component, 
2nd do. 
Single line, . : j : 
Faint double line: 1st component, 
2nd do. 
Strong line, : : : 
Fine line, 
Intensity 
of black, or 
thickness 
of line. 
n 
PP eeDww omer 
ON 
n 
HHernme BP Hon 
a eo) 
Breen Heo 
Appear- 
ance by 
graphical 
compara- 
tive 
symbol. 
Then ensues a markedly blank portion of spectrum. 
Clear line, 
Hazy line, 
Sharp line, 
Do. 
Faint band : Ist side, 
2nd do. 
Clear double : 1st component, . 
2nd do. 
Fine line, 
Do. : c 
Do. ‘ : 
Strong line, 
Fine line, 
Do. 
Do. 
Strong double line: 1st component, . 
2nd do. 
He bop wp 
— 
mH HE bd po 
ow co Meet p 
PLACE- 
Micrometer Le i 
Reading. Angstrom’s 
Spectrum. 
13°490 
13°555 
13°615 
13°674 
13°753 
13-790 46 952 
13°810 
13°866 
. 15°762 
~_“. 
13'925 |46 993 
13980 | 47 007 
14°100 
14°130 
14°176 
14217 
14°305 
14°360 
14°425 
14°455 
14°495 
14°710 47 183 
14°778 
14°840 
14:907 
15030 
15107 
15°158 
15170 
15°250 
15°327 
15°345 
15°422 
15°465 
47 291 
47 305 
47 450 
15°893 
15°940 
16°020 
16°105 
16°122 
16193 |) 
16°243 | { 
16°325 
16°363 
16-430 
47 571 
16°510 
16°557 
16°610 
16640 
16°668 
16°683 
47 674 
47 680 
Chemical-origin- 
data from 
Angstrom, 
Thalen, &e. 
Tron. 
Chromium. 
Tron. 
Tron. 
Tron. 
Iron. 
Tron. 
Tron. 
Tron. 
Tron. 
Iron. 
Tron. 
Titanium. 
Tron. 
Cobalt. 
Calcium. 
2 
Cobalt. 
Tron. 
Titanium. 
Iron. 
Tron. 
Tron. 
Concluded 
WAVE 
NUMBER- 
PLACE, per 
British Inch. 
46 
46 
46 
46 
886 
900 
914 
926 
46 949 
46 958 
46 966 
46 978 
46 992 
47 008 
307 
Differences. 
Breadths & 
Doubles. 
16 
13 
Distances. 
1h. 10m. P.M. Sun cut off by stove-pipe. Mem.—Focus-tube of collimator is now pushed close in; and focus- 
tube of telescope is in middle of its range. 
6 June 25, 1878. 
10h. 30m. A.M. 
Prisms 6, 8, and 4: Dispersion =28°. 
